Method and machine for lining an armature core with a flexible strip



March s, 1928. 1,661,355

R. W. BAKER METHOD AND MACHINE FOR LINING AN ARMATURE CORE WITH AFLEXIBLE STRIP Filed March 29. 1926 6 Sheets- Sheet I hid 630: new

March 6, 1928. I 1,661,355

R. w. BAKER METHOD AND MACHINE FOR LINING AN ARMATURE CORE WITH AFLEXIBLE STRIP Filed-March 29. 1926 s Sheets-Sheet 2 l ll/ //4- vgwmmkoz W W M March 6, 1928.

R. W. BAKER I METHOD AND MACHINE FOR LINING AN ARMATURE CORE WITH AFLEXIBLE STRIP File ad March 29. 1926 6 Sheets-Sheet 3 a nu m1 Tot llivy March 6, 1928. 1,661,355

R. w. BAKER METHOD AND MACHINE FOR LINING AN ARMATURE CORE WITH AFLEXIBLgS- STRIP Filed March 29. 1926 5 Sheet Sheet 4 W aftozucqd March6, 1928. 1,661,355

R. W. BAKER METHOD AND MACHINE FOR LINING AN ARMATURE CORE WITH AFLEXIBLE STRIP Fi l e d March 29. 1926 6 Sheets-Sheet 5 7 I /0 20 205 mI X 200 I d) 203 March e, 1928. 1,661,355

R. W. BAKER METHOD AND MACHINE FOR LINING AN ARMATURE CORE WITH AFLEXIBLE STRIP Filed March-29. 1926 6 Sheets-Sheet 6 Patented Mar. 6,1928.

UNITEDSTATES PATENT OFF-ICE RUSSELL VJ. BAKER. OF ANDERSON, INDIANA,ASSIGNOR, BY IVIESNEASSIGNMENTS, TO.

DELCO-REMY. CORPORATION, OF DAYTON, OHIO, A CORPORATION OF DELAWARE.

MIITHOI) AND MACHINE FOR LINING AN ARMATURE CORE WITH A FLEXIBLE STRIP.

Application filed March 29, 1926.

This invention relates to the manufacture Ofttl'll'ltitlllQS itordynamo-electric machines and particularly to the lining of armature coreslots 01'? insulating material preparatory to winding the armature. Ithas been the practice heretofore to wrap about the armature core asingle strip of sheet insulatinginatcrial which surrounds each o't thecore teeth and lines the slots between the teeth. After insulating thecore in this manner the arnuitnre is wound with a numher of turns ofwire which obviously will retain the slotlining insulatingportions ofthe strip in position. After winding, the insulation is cut at the edgeof the core teeth in order to remove those portions of the iiisulatingstrip which surround the periphery of each core tooth, thus leaving onlythose portions which line the core slots.

One of the objects oi? the invention is to reduce the cost 01 theoperation of wrapping about the armature core a strip of insulatingmaterial. The invention is therefore embodied in a machine by which thisinsulating operation n'iay he carried out with great rapidity.

Further objects and advantages of the present invention will be apparentfrom the following description, reference being had to theaccon'ipanying drawings, wherein a preferred form of embodiment of thepresentinvention is clearly shown.

In the drawings:

F 1, 3 and 1: are diagrammatic views illustrating the mode of operationoi the machine.

*igs. and 6 illustrate further steps in the manutacture of an armatureafter having been operated upon by the machine eniljiod-ying the presentinvention.-

Fig. '7 a plan view of the machine. a part heing broken away 1 .01 sakeof clearness.

Fig. 8 is a sectional "view on the line 8-8 of Fig. 7.

9 and 10 together constitutea side view ot the machine in the directionof the arrow 9 of Fig. 7.

Fig. 10 a View in the direction of arrow 1O" of Fig. 10.

Fig. 11 is a. view of the machine drive shaft and'clutch controlmechanism look- Serial No. 98,185.

Fig. 16 is a side view of the plunger reciprocating mechanism.

Fig. 16" is an edge View of the plunger reciprocating mechanism.

Fig. 17 is a side view of the folding slide operating mechanism.

The mode of (operation of the machine will be iii-st described withreference to Figs. 1 to 1. In these figures 20 designates a new slottedarmature core-which is attachedto an armature shaft 21. The operatorplaces astrip of paper in the position-shown in Fig. 1. so that its end22 extends beyond the core slot 28 which is the first one to receive theinsulation. Then av folding slide 2a is caused to move toward the rightuntil it occupies the position shown in Fig. 2 in order to push thestrip 22 into the slot 23. The slide 24 is retracted from the slot 23leaving a loop 25 of insulation paper within the slot. Then acylindrical pointed plunger 26 is caused to-descend and enter the slot23 and cause the paper loop 25 to be rounded out as indicated in 25 ofFig. 3 in order that this loop will conform to the shape oi'the slot.Then, while the plunger 26 is within the slot 23 and is thus holding theinsulating paper in position, the plunger 26 is movedbodily inaclockwise direction ahoutth'e axis of the shaft 21, thus rotating thecore 20 so that the next succeeding core slot23 will be moved adjacentto the forming slide 24. 'lVhile the plunger 26 remains in the slot 23and the strip portion 29 surrounding the periphery of an adjacent coretooth is held against said tooth so that said strip will not sliprelative to the core, the slideQa is advanced as'before until it forms asecond paperloop 25 in the slot 23", as shown in Fig. 4. After the slide24'is with drawn, the plunger 26 is withdrawn from lll lit?

the slot 23% and is turned back into alignment with the slot 28. lhenthe plunger 26 descends in order to spread out the paper loop so that itwill conform to the shape of slot 28* while the paper is still clampedto the core tooth periphery. 'lhis operation is continued until all ofthe slots have been lined with insulating paper and the end 22* of thestrip overlaps the end 22 which entered the slot 23, as shown in Fig..llecessarily," the paper is fed to the core automatically after one endof it has been located as shown in 1.

After covering the armature core with a strip of insulating material,windings rep resented by the small circles 27 in Fig. 5 are applied, andthen the paper is cut at the edges 28 of armature core teeth so that thesuperfluous pieces of paper 29 may be removed, as shown in Fig. 6.

The machine for performing the operations illustrated in Figs. 1 to tcomprises chiefly a mechanism for reciprocating the slide 241-; amechanism for vertically reciprocatingthe plunger 26; a mechanism forturning the plunger 26 about an axis in alinement with the axis of thearmature shaft 21; a "WOl'k carrier by which an armature core istransferred from a loading position to an operating position adjacentthe folding slide 2 1; a mechanism for locking the work carrier inoperating position as long as the other mechanisms are in operation; anda control apparatus for causing the mechanism to automatically stopafter all of the slots have been lined with insulating material.

The machine comprises a main frame 30 which provides a bearing 31 for ashaft 32 carrying a belt driven pulley 33. The shaft 32 operates a gear341- which meshes with a gear 35 loosely journaled upon a shaft 36 whichis supported by bearings 37, 38 and 39. lhe gear 35 carries a frictionclutch disc 10 adapted to. cooperate with a clutch disc ll which ismoved sidewise by a grooved collar 12 slidably connected with the shaft36 by pin and slot connections 18 and 14, (see Fig. 7 When the clutchmembers 40 and 41 are connected the drive pulley d3 will rotate theshaft 36.

- ,ldeferring to Figs. 9, 13 and 17, the paper folding" slide 24: isoperated by a mechanism including a cam which is operated by shaft 36and which co-operates with a roller 51 attached to lever 52 which ispivoted by screw 53 attached to the machine frame 30. A spring 5%,connecting the lever 52 with the machine frame maintains the roller 51in engagement with the cam 50. The lower end of lever 52 is providedwith a notch which receives a pin 56 attached to the slide 24. The slide24 is guided by a grooved guide 57 provided by a work holder bracket1-02 to be described.

Referring to Figs. 9, 10, 10, 16 and 16,

the mechanism for vertically moving the pointed plunger26 includes asliding shaft 60 which is guided by bearings 61, 62 and 63 provided bythe machine frame 30. The shaft 60 is in axial alignment with thearmature shaft 21 when the armature core 20 is in position for receivingthe operations of the machine, and the pointed plunger 26 is carried bythe head in such a position that it is adapted to be received by thearmature core slots. The sliding shaft 60 is provided with a groove 65which is adapted to receive rollers 66 carried by a bifurcated bellcrank lever 67 which is pivoted upon a rod (58 sup ported by the machineframe. The lever ('37 carries a roller ('39 which co-operates with a cam70 driven by the shaft 36. The roller (39 is urged against the cam 70 bya compression spring 72 which is received by a cent 'al recess 73 in theupper end of the rod 60 which slides within the bearing 61. The spring72 is locatcdbetween the bottom of the recess 73 and a plate 74: whichis zit-- tached by screws 75 to hearing 61.

The mechanism for twisting the shaft 60 is shown in Figs. ll and 15, andincludes a cam which is operated by the shaft 36 and co-operates with aroller 81 connected with a lever 82 which is pivotally supported by therod 68. The lever 82 has a slot 82 which receives a pin 83 attached to asliding rod 8% having an adjustable extension 85. The extension 85 isprovided with a slot 86 which receives a screw 8? attached to a lever 88which is located between the bearings ('32 and 63. The lever 88 includesclamping portions 89 and 90 which co-operate with. a clamp screw 91which passes through a plain hole into part 90 and is threaded into part89. lhese parts are held in position by a key 92 which is received by akeyway 98 in the shaft 60. The roller 81 is maintained in engagementwith cam 80 by the spring 7'2 shown in Fig. 10. Besides being acompression spring, spring 72 is a torsion spring having one end l2attached to the shaft 60 adjacent the bottom to the recess 78, andhaving its other end 72" attached to the plate 74-. Referring to Fig.1-0 the plate 741 is provided with arcuate slots 94 which receive thescrews 75. When the screws 75 are loosened the plate 74 may be turned tovary the torsional effect produced by the spring 72 upon the shaft 60.By tightening down the screws 7 5 the plate 7 1 will be secured in thedesired position of adjustment. As viewed in F 14, the cam 80 tends tomove the lever 88 in a countercloclnvise direction, but the spring 72 isso twisted that it tends to rotate the lever 88 cloclnvise, thusn'iaintaining the roller 81 in engage ment with the cam 80. 7 V

A work holder 100 which is circularly segmental in form is pivotallymounted upon screw 101 on a work holder bracket 102 imam-355 providedwith a shoulder 106 joining the-- surface 103 with surface 107approximately tangent to the'surface 103. This shoulder providesa stopfor the insulating paper strip 22 which is guidedtowardthe stop 106 bythe surface 107. The work holder 100 is provided with cylindricalrecesses 108' each of which receives a solid rotatable block 109, whichhas the same contour as the armature core which is received by therecess.

The block 109 is provided with a central hole'110-adapted toreceive thearmature shaft 21 and with slots 111 which are adapted to be located inalignment with the slots of the armature-core. The side wall of each ofthe recesses of 108 isprovided with an opening 11.2 leading to theperipheral surface 101-. These openings are provided for the purposeotreceiving the paper folding slide 24.. Each block 109' is rotatablewith in the recess 108 and is maintained in a certain position by springpressed ball 118 which is urged by a spring 1L1 into engagementwvith theedges of'th'e teeth parts 115 which define the slots'lll. A plug-110maintains the spring llt inposition. The work holder is operated by ahandle 117 in orderto bring either ofthe .slots 112 opposite the end ofthe paper folding slide 21. Motion of the work holder 100 is limited ineither direction by pin-118 attached to the bracket 1.02 and received byan'arcuate groove 119 provided in-the bottomof-the work holder 100. Thework holder 100 is yieldin'gl'y maintained in either of these positionsand accurately located by a plunger 120 wvlrichis yieldingly pressed'byspring 121 into either of two depressions 122 in the holder. The spring121 is retained in position .by plug 123. r

Thework holder 100 carries adjacent each recess 108 asp-ring pressed'ballor'plunger 124.- which adapted to be received by one of the notchesof an armature core 20 which is placed within the recess in order toyieldingly maintain the core slotsin alignment with slots 111 of therotatable plug 109.-

The ball 121 is urged inwardly by a spring 125 which is retained by aplug 120.

The diameter of a recess 108 is greater than the diameter of the core 20to provide clearancefor the insulating strip 22. In order that the coreslot. which is operated upon by 'the plunger 2G will be in alignmenttherewith and in order that the paper insulation may be yiel .linglyclamped against a core tooth periphery adjacent said slot means areprovided for urging the armature core being operated upontowardth'atside of 'the reeess108 which is nearest-the opening 112.Adjacent eachrecesslOS there is locatedei slide 200 which is guided by arecess' 201 in a guide block 202 attached by screws-203to the workholder 100. The work holder is provided with anotch 201 leading fromeach recess 201 into each recess 108 inorder'thatthe slide 200 mayextend withinth'e'rccess 108.- Eaclr slide 200 is yieldingly urgedwithin a recess 108 by a spring 205. \ihenever a recess 108 is moved toan unload-mg position, its slide 200 is automatically retracted by themanipulationof handle 117; and, by moving a recess 108 to the operatingposition'b'y manipulation of the handle 117, the spring 205 adjacentthat recess is automatically released to urge a slide 200 into thatrecess-so that the armature core to be operated upon will be urgedagainst'th-at side of the recess which-is adj acent the passage 112. Inthisway the core slot next to receive the plunger 26' will be locatedmore nearly in vertical alignment therewith.

l.he-n'1echanism operated by the handle 117 for automaticallycontrolling the slide 200 comprisesalever 206 pivotally connected by ascrew 207 to the work holder 100.

The lever206 isprovided with slots 208 each adapted to receive a screw209 altached to a slide 200. The lever is provided with 1ingers 210adapted to be engaged'by fingers 211 provided-by bracket 212 attached byScrews 213 to the handle 117 which is pivoted upon the screw 101, butnot directly connected with the work holder 100. Movement of handle-117'ina .countercloclnvise directi.on,- for example, inorder to movethe upper recess 108 (as viewed in Fig. 7) to operating position willcause the lever 200 to move counterclockwise so that the upper slot 208will be so moved relative to the upper screw 209'as to permit the upperspring 205 to. move the upper block 200 to- Ward'the left. At the sametime the lower slot 208 will bemoved toward the fulcrum screw 201so thatsaid slot will engage the lower screw 209 in order to retract the lowerblock 200 from the lower recess 208. It

is obvious thatmovement of lever 117 in a 55 iii cesses 108 opposite theslide21 while the machine is in operation by mechanism i which includesa slide guided by the frame'30 and bracket 102'and adapted to bereceived by either of two cylindrical rccesses l31provided by the workholder 100.

Theslide 130 is controlled by the mechanism 11 which also controls thestarting and stopping of the machine,

When the machine shaft- 36 is at rest the clutch shitt ingmember 42 willbe moved to the left. of the position shown in Fig. 11 so that clutchmember 41 will be disengaged from the clutch member 40. The member 42 isprov tied with a flange to which is securet a brake disk 141. which, inthe rest position ot the machine, is caused to bear yielding-1y againsta stationary brake Surlace provided by hearing 38. The grooved collar 42receives pins 143 carried by the members 144 of a bifurcated shittinglever 1-15 which is pivoted at 146 upon the machine :t'rame. The levercarries a I stud 147 which is adapted to be engaged by a screw 148 whichis adjustably carried by a lever 149 which is alsosupported by the pin146. hlm'mally the lever is urged. in a counterclockwise direction byspring 1550 hearing against a plug 151 attached to the machine trams andagainst a lung tornr ing a part oi lever 149. The screw 148 is securedin adjusted position by a nut 153. lllormally the spring causes thelever 149 to move so that the screw 148 will engage the stud 147 tocause the lever 145 to move counterclockwise so: that the brake disk 141will he yieldinp ly urged into contact with the brake member 142. l nthis way the machine is brought quickly to rest after the clutch members141 and 140 are disenrnugetl.

To engage the clutch memljiers 40 and 41 the operator depresses a pedalwhich is pivoted. at 161 upon a bracket 1G2 and which is attached at 163to a link 164. Link 164 attached bypin 165. to a bell crank lever 166which is tulcrumed upon a screw 1137 attached to the machine frame.Lever 156 is provided with a notched end 168 which receives a pin 169connected with the locking slide 130. @bviously when the pedal 180 ismoved in a countercloclnvise directioin as viewed in Fig. 12, the bellcrank lever 166 will, be moved clockwise and the slide 130 will beshifted so as to be received by one of the recesses 131 in the workholdor 100 so as to prevent movement of the work holder while themachine isin motion.

During; the motion of pedal 160 described, the lo 166 on ages the end170 of the lever 1-191 and will cause it to move in a clockwisedirection as viewed in Fig. 11. This movement of the lever 149 willcause the lever 14-5 to move toward the right and the clutch member 141to be yieldingly pressed against the clutch member 140 due to a spring:171 which transmits motion in one direction between the levers 149 and1.45. il hen the clutch members are engaged, as shown in Fig. 11. thelever 149 will be latched in this position by virtue ofthe engagement ofa latch plate 172 attached by screws 17 3 to the lever 149, with ashoulder 174 provided by a latching lever 175 which is pivoted at176upon the machine frame. The latching lever is urged in acounterclockwise direction by a spring 177 hearing at its left endagainst the machine frame 30 and at its right end against a collar 178carried by a rod 179. The rod 179 is attached at 180 to lever 1'75 andits left, end slides through the machine frame and carries a pin 18.1.The latching lever 175 is controlled by a rotatable cumming stud 182which is aoapted to engage the end 183 oi lever 175 and to move thelever in a clockwise direction in order to disengage it from the latch17 2. This camming stud 182 is attached to the hub 18 1; of a gear 185which is mounted upon a stub shaft 186 attached. to a bracket 38extending from the bearing bracket 38 (see Figs. 7 and 12). The gear 185meshes with a gear 187 attached to the shaft 36. Tlhese gears have aratio depending upon the number of slots in the armature core. Forexample, it the core has seven slots it is desirablc that the machineperforms eightv operations before stopping so that the first slotreceiving the insulation will receive the slide and the plunger againbefore the machine steps. This is necessary in order that the ends 22"and 22" of the insulation strip will overlap one another as shown. inslot 23 in l ie'. 5. .l.heretore, if the core has seven slots the ratioof gears 187 and 185 is 1 to 8. That is, the gear 187 will rotate eighttimes to produce one revolution of gear 185. lihen the machine hasperformed the rccuired nun'iber of cycles to line all of the core slotsand to cause the ends of the insulating; strip to overlap in the firstslot to receive insulation (slot 2? in Fig. 5), the machine will bestopped automatically due to the engzirgement of the cam 182 with thelever end 183. As soon as the latch lever 175 is released from the plate172, the lever 149 will born-god in a counterclockwise direction by thespring 150, and the brake members 141 and 142 will be engaged so thatthe machine will stop promptly.

in order to stop the machine at any time before its predetermined numberof cycles have been completed there is provided ahand lever 190 which ispivoted upon a pin 191 carried by a bracket 192 attached to the machineframe. The left end of the lever 190 as viewed in Fig. 9, is providedwith a'notch 199 which receives the rod 179, and the end of leverengages the .pin 1.81. By pressing a handle 195 carried by the lever 190toward the machine the rod 179 will be moved't-oward the lett, as viewedin Fig. 7 in order to withdraw the lever 17 5 from the latch plate 172.The, handle 195 is urged away from the machine by a spring 196 locatedbetween the lever 190 and the machine frame and received by a recess197.

To use the machine; the operator will place ran-armature core within oneof the recesses viewed in Fig. 12. in order to lock the work holder inthe desired positionuand toscause the machineto'function in' the. mannerdescribed. The cams 60,70 and 80 are so constructed and timed toproducethe movements of the slide 2% and the! plunger 60 as describedwith referenceto Figs. '1 to 4.

-During one cycle of movements of the slide E l" and; plungerGO thepaper strip is pushed into a slot by the slide to form aznarrow loop"which is spread out by the plunger and while theplunger is receivedbythe slot thenbeing lined, it is bodily rotatcd about the axis of thesupporting block 109 in order to move :the core the angulardistancebetweenthe core slots. During the next cycle, the slide Q Lenters the succeeding slot while the paper isclamped in position withinthe preceding slot by the plunger which sti'lllocated within it, andwhile thepaper is clamped;

against the periphery of the preceding adjaccnt core. tooth due to theoperation of the spring pressed slide 200. 'Thusthe paper :st-rip fedautomatically by the operation ot" the slide in pushin'g a loopofpaperinto -the slot. *Then, after-the slide 24 has been withdrawn fromthe succeeding slot and WlIIlC' the paper strip is clamped between therecess wall 'and an adjacent core toothperiphery, the plunger 26 isoperated to spread out the loop just. formed-by the slide. As

the loop is spread out by the plunger, more of the paper strip is fedinto the slot then i being lined.

lVhile the machine is in operation the op- 'erator will load the recess108 which is more remote from the slide 24.

At the end of the ;predetermined.number of operations of the machine,themachine will stop automatically and the slidelSO will be withdrawnautoniatically so that the work holder may 50 non-insulated core thereininto position positions referred to in which the plunger 130 isalignedwith one of the recesses 131, the machine cannot be started. In anyother position of the work holder movement of the plunger 130 toward theright in Fig. 12 would be obstructed, hence the pedal 160 can not thenbe operated to cause the clutch members 41.0 and 41 to be engaged.

While the form of embodiment of the present invention as hereindisclosed, constitutes a preferred form, it is to be understood thatother forms might be adopted, all coming within the scope of the claimswhich follow.

'lVhat is claimed is as 'l'ollows:

l. The method of lining an armature core with a ticxible strip oiinsulating material, which includes pushing the strip into the ("re in adirection transverse to the core i is to 'lorm a narrow loop of materialwithin the core. introducing a suitable tool into the end ot the slotand narrow loop, moving the tool endwise of the core to cause the loopto be spread out and to conform to the side walls of the teeth. definingthe slot, and pushing a loop of material into a succeeding slot while.the tool remains within the preceding slot.

' Q. The method of lining an armature core with a flexible strip ofinsulating material, which includes pushing the strip into the core inndirection transverse to the core axis to form a narrow loop ofi'naterial within the core, introducing a suitable tool into the end ot'the slot and narrow loop, moving the .tool (lulu of the core to causethe loop to he spread out audio contorm to the side walls oi? the teethdefining the slot, and pushing a loop of material into a: succeedingslot while the material is clamped against the periphery of a. adjacentcore tooth.

'2). )1 machine for lining an armature core with a ficxible strip oliinsulating material, comprising, in combination, a core holder, means"for introducing a loop of paper into in core slot, and means torspreading the loop -to cause itrto 'engagethe sides of the core teethdefining the slot.

41*. A machine for lining an armature core with a llcxiblc strip ofinsulating material, comprising, in combination, a core holder; .amember movable transversely oi the core for pushing' a portion ot thestrip into a core slot to form a loop therein: a member movable axiallyof the core for entering the slot and loop toforce the loop intoengagement with the walls of the core; and mechanism tor auton'iatically(merating the members and for moving the core progressively intodill'ercut operating positions.

with a, flexible strip of insulating material, comprising,iii-combination, a core holder; a slide movable transversely of the corefor pushing a portion oil the s r: o a core slot to li'orm a looptherein; a pointer. plunger movable axially ot the core for en teringthe slot and loop to force the loop into engagement with the walls ofthe core; and mechanism for causing in recurrent sequence the slide toenter into and withdraw from a slot, the plunger to enter said slot, theplunger then to be rotated bodily about the axis of the core while stillWithin said slot in order to move the core into the next operatingposition, and the plunger then to o. A machine for lining an armaturecore ie withdrawn from said slot and to be reatcd bodily to position inalinement with l 2 next succeeding slot to be operated upon.

6. A machine for lining an armature core with a flexible strip ofinsulating material, con'iprising, in combination, means for introducinga loop oi? paper into a core slot; and. means tor sprca ling the loop tocause i t to engage the sides oi the core teeth detining the slot; awork holder having a recess tor receiving a core and the insulationwhich covers thecore tooth peripheries, and adapted to receive theloop-forming means and the loopspreading means; a device for urging acore yieldingly toward one side of the recess in order to clamp thestrip be tween the recess wall and a core tooth; and means tor operatingsaid loop-forming means and said loop-spreading means and for rotatingthe core within. the recess.

7. A machine for lining an armature core with a flexible strip o't'insulating material, comprising, in combination. means for introducing aloop of paper into a core slot; and means for SPL'QZLCliHQ' the loop tocause it to engage the sides ot the core teeth defining the slot; atwork holder having a recess tor receiving a core and the insulationwhich covers the core tooth peripheries, and ada 'ited to receive theloop-forming means and the loop-spreading means; a work hold or having aplurality oi. recesses each for re- UQlVlHQ a core and the insulationstrips placed about it'and adapted to move the cores successively fromloading posit-ion to av position for operation by the machine, eachrecess, when in the machine operating position, bein adapted to receivethe loop forming means and the loop spreading means; a device adjacenteach recess for urging a core yieldingly toward one side of the recessin order to clamp the strip between the recess wall and a core tooth;means for moving the work holde and tor causing each of said devices tobe inoperative when the recess with which the device co-operates is inloading position; and means tor operating said loop-forming means andsaid loop'spread- .ing means and for rotating the core within therecess.

h. A machine for lining an arn'iature core with a flexible strip ofinsulating material, comprising, in combination, means for introducing aloop of paper into a core slot; and means for spreading she loop tocause it to engage the sides of the core teeth defining the slot; a workholder having a recess'ltor receiving a core and the insulation whichcovers the core tooth peripheries, and adapted to receive theloop-"forming means and the loop-spreading means; a work hold or havinga plurality of recesses each for receiving a core and the insulationstrips placed about it and adapted to move the. cores successively fromleading position to a position for operation by the machine, eachrecess, when in the machine operating position, being adapted to receivethe loop-forming means and the loops ireading means; power operatedmeans for operating the loop-forming means and the loop spreading meansand for rotating the core within the recess; and control means operableto connect said last means. with a source of power only when the workholder is in position to locate a core in position for operation by themachine.

9. A machine such asdefined by claim 3, in which the operation of thecontrol means to connect the power operated means with a source ofpower, also etlects the movement of a device for locking the work-holdor until the machine stops.

10. A machine for lining an armature core with a flexible strip ofinsulating material, con'iprising, in combination, means for introducinga loop ot paper into a core slot; and means for spreading the loop tocause it to engage the sides of the core teeth defining the slot; awork-holder having a recess for receiving a core and the insulationwhich covers the core-tooth peripheries, and adapted to receive theloopforming means and the loop-spreading means; a work-holder having aplurality of recesses each for receiving a core and the insulation stripplaced about it and adapted to move the cores successively from aloading position to a position for operation by the machine, eachrecess, when in the machine-operating position, being adapt ed toreceive the loop-forming means and the loop-spreading means;power-operated means for operating the loop-forrning means and theloopspreadingmeans and for r0- tating the core within the recess; andmeans for stopping the machine autoi'natically atter all of the slots ofa core have been lined with insulation.

In testimony whereof 1 hereto affix my signature.

RUSSELL WV. BAKER.

